Set untagged VLANs to tagged before adding a new untagged VLAN member…

[tim-rj]

… for a port

fix Azure/sonic-buildimage#6271

Check whether the port is already an untagged member of another VLAN
when adding an untagged member to a VLAN. If true, set the previous
one as tagged.

Signed-off-by: tim-rj [email protected]

- What I did

fix Azure/sonic-buildimage#6271

- How I did it

Check whether the port is already an untagged member of another VLAN when adding an untagged member to a VLAN.
If true, set the previous one as tagged.

- How to verify it

1. Adding a port as an untagged VLAN member
2. Adding the same port as an untagged member of another VLAN
3. show vlan brief

- Previous command output (if the output of a command-line utility has changed)

root@sonic:/home/admin# config vlan member add 10 Ethernet11 -u
root@sonic:/home/admin# config vlan member add 20 Ethernet11 -u
root@sonic:/home/admin# show vlan brief
+-----------+--------------+------------+----------------+-----------------------+-------------+
|   VLAN ID | IP Address   | Ports      | Port Tagging   | DHCP Helper Address   | Proxy ARP   |
+===========+==============+============+================+=======================+=============+
|        10 |              | Ethernet11 | untagged       |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+
|        20 |              | Ethernet11 | untagged       |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+

- New command output (if the output of a command-line utility has changed)

root@sonic:/home/admin# show vlan brief
+-----------+--------------+------------+----------------+-----------------------+-------------+
|   VLAN ID | IP Address   | Ports      | Port Tagging   | DHCP Helper Address   | Proxy ARP   |
+===========+==============+============+================+=======================+=============+
|        10 |              | Ethernet11 | untagged       |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+
|        20 |              | Ethernet11 | untagged       |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+
root@sonic:/home/admin# config vlan member del 10 Ethernet11
root@sonic:/home/admin# config vlan member add 10 Ethernet11 -u
root@sonic:/home/admin# show vlan brief
+-----------+--------------+------------+----------------+-----------------------+-------------+
|   VLAN ID | IP Address   | Ports      | Port Tagging   | DHCP Helper Address   | Proxy ARP   |
+===========+==============+============+================+=======================+=============+
|        10 |              | Ethernet11 | untagged       |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+
|        20 |              | Ethernet11 | tagged         |                       | disabled    |
+-----------+--------------+------------+----------------+-----------------------+-------------+

[pettershao-ragilenetworks]

help forward this, thanks!